E3S Web of Conferences (Jan 2024)

Hydrogen Liquefaction Process with Mixed Refrigerant Pre-cooling

  • Liu Zilong,
  • Zhao Lianpeng,
  • Feng Yangmin

DOI
https://doi.org/10.1051/e3sconf/202451801011
Journal volume & issue
Vol. 518
p. 01011

Abstract

Read online

A novel hydrogen liquefaction process based on precooled mixed refrigerant is proposed in this paper. The specific energy and the exergy loss are also analyzed. The feed gas with a temperature of 302K and a pressure of 2.012MPa is first precooled to 81K with mixed refrigerant. Three refrigerant cycles with hydrogen expanders and one with throttling valves are adopted to cool the gaseous hydrogen to 21K. The proportion of para-hydrogen of the product is 99%. The specific energy consumption of the process is 9.28 kW·h/kgLH2 and the exergy efficiency is 24.3%. Furthermore, the exergy analysis indicates that the exergy loss caused by heat exchangers, compressors and expanders weights the most.